Descriptions of New or Little-known Orthoptera. 



427 



I found in fairly large numbers in Namaqualand, but always on bushes, 

 not on the ground like H. pupus. The male invariably revealed its 

 presence by a twice or three times repeated loud and piercing raspy 

 stridulation when I was as far as three or four paces distant. It 

 would then try to drop awkwardly to the ground, endeavouring at the 

 same time to break its rapid descent by clinging by one or more legs 

 to the twig or branch. 



FIG. 4. 



All the South African Hetrodinae make this noise when alarmed, 

 or fearing danger. 



They are mostly found in the plains where short grass or stunted 

 vegetation occurs, and can thus be looked upon as deserticolous. They 

 are not saltatorial, and their gait is veiy clumsy. They do not 

 copulate on the ground but on bushes, stunted or not. The position 

 assumed by the two sexes is peculiar, as shown by the sketch of a pair 

 of AcantJioproctus bechuanus in coitu very kindly supplied me by Bro. 

 J. H. Power. The male is underneath (fig. 4). 



